... -frequency hardening heat treatment. For example: crank shaft, ram, piston pin, camshaft, vavle. transmission within the various gears, shifting fork, spline ... example: vice, locking pliers, spanner.hydranlic components: for example:the plunger, rotor, reversing shaft in vavle,gear high-frequency hardening machine ... can be from 3KG to 300KG. 70KW high frequency induction pin hardening machine